138938770 has 24 divisors (see below), whose sum is σ = 252066276. Its totient is φ = 55139328.

The previous prime is 138938753. The next prime is 138938777. The reversal of 138938770 is 77839831.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 27994681 + 110944089 = 5291^2 + 10533^2 .

It is a super-2 number, since 2×138938770² = 38607963618225800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 138938770.

It is not an unprimeable number, because it can be changed into a prime (138938777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 372304 + ... + 372676.

Almost surely, 2^138938770 is an apocalyptic number.

138938770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138938770 is a deficient number, since it is larger than the sum of its proper divisors (113127506).

138938770 is an equidigital number, since it uses as much as digits as its factorization.

138938770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 573 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 138938770 is about 11787.2291061131. The cubic root of 138938770 is about 517.9340737891.

The spelling of 138938770 in words is "one hundred thirty-eight million, nine hundred thirty-eight thousand, seven hundred seventy".